What do you think would happen if the Modly ones suddenly decided that each player could have only one nation?
Aack! Don't say that, even in jest!
Do you know which region you would choose?
That would be a tough one. The Lexicon was my first region, but I also have an active nation that's having a lot of fun in a raiding region. It would be a tough choice between them right now. Currently, I don't have to choose. I can belong to as many regions as I want, limited only by time and the one-UN rule.
Would it force the off site gameplay to be even further removed from actual NS gameplay?
Probably. Most of my nations have no connection to Romanar, and even if I couldn't use them on NS, I'd want to keep them offsite, even though most of them are semi-inactive right now.
Would the forums continue even after the regions emptied and died?
Probably
Would it be good or bad for NS?
IMO, bad! As you can tell from my above, I like having multiple nations. It gives me a chance to explore multiple aspects of NS, which would be difficult or even impossible with one nation.
Would it make no difference at all except make it easier for the Mods and therefore a very possible move?
It would make a very big difference to me.